Genesis 24:2-9

2Then Abraham said to his servant, the oldest of his household who managed everything that belonged to him, “Now put your hand under my thigh,

3so that I may make you take an oath by Adonai, the God of heaven and the God of earth, that you will not take a wife for my son from among the daughters of the Canaanites among whom I am dwelling.

4On the contrary, to my land and to my relatives you must go and get a wife for my son Isaac.

5But the servant said to him, “Suppose the woman were unwilling to follow after me to this land? Should I then have your son go back to the land you came from?

6Abraham said to him, “See to it that you don’t return my son there.

7Adonai, the God of heaven, who took me from my father’s house and from my native land and who spoke to me and made a pledge to me saying, ‘To your seed I will give this land’—He will send His angel before you and you will take a wife for my son from there.

8If the woman is not willing to follow after you, then you will be free from this oath of mine. Nevertheless, you must not return my son there.”

9So the servant put his hand under the thigh of Abraham his master, and he made a pledge to him concerning this matter.